1.Key number: 28
2.BT version: BT3.0
3.Distance: 10M
4.Frequency: 2.402-2.480GHz
5.Compatibility：2000/XP/Vista/7,8,10Android, Mac OS etc.
8.Battery: Built-in lithium polymer battery
9.Battery spec:
- Capacity: 300mA
- Playing time: About 80 hours
- Standby: About 9 month
- Charging time: About 2.5 hours
10.USB: Mini USB for charging
11.Size: 115.43*102.88*11.4mm （L*W*H）
